

package com.hazelcast.replicatedmap.impl;

import com.hazelcast.config.MergePolicyConfig;
import com.hazelcast.config.ReplicatedMapConfig;
import com.hazelcast.replicatedmap.impl.operation.MergeOperationFactory;
import com.hazelcast.replicatedmap.impl.record.ReplicatedRecord;
import com.hazelcast.replicatedmap.impl.record.ReplicatedRecordStore;
import com.hazelcast.spi.impl.NodeEngine;
import com.hazelcast.spi.impl.merge.AbstractMergeRunnable;
import com.hazelcast.spi.impl.operationservice.OperationFactory;
import com.hazelcast.spi.merge.SplitBrainMergePolicy;
import com.hazelcast.spi.merge.SplitBrainMergeTypes.ReplicatedMapMergeTypes;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.function.BiConsumer;

import static com.hazelcast.replicatedmap.impl.ReplicatedMapService.SERVICE_NAME;
import static com.hazelcast.spi.impl.merge.MergingValueFactory.createMergingEntry;

class ReplicatedMapMergeRunnable extends AbstractMergeRunnable<Object, Object, ReplicatedRecordStore, ReplicatedMapMergeTypes<Object, Object>> {

    private final ReplicatedMapService service;

    ReplicatedMapMergeRunnable(Collection<ReplicatedRecordStore> mergingStores, ReplicatedMapSplitBrainHandlerService splitBrainHandlerService, NodeEngine nodeEngine) {
        super(SERVICE_NAME, mergingStores, splitBrainHandlerService, nodeEngine);

        this.service = nodeEngine.getService(SERVICE_NAME);
    }

    @Override
    protected void mergeStore(ReplicatedRecordStore store, BiConsumer<Integer, ReplicatedMapMergeTypes<Object, Object>> consumer) {
        int partitionId = store.getPartitionId();

        Iterator<ReplicatedRecord> iterator = store.recordIterator();
        while (iterator.hasNext()) {
            ReplicatedRecord record = iterator.next();

            ReplicatedMapMergeTypes<Object, Object> mergingEntry = createMergingEntry(getSerializationService(), record);
            consumer.accept(partitionId, mergingEntry);
        }
    }

    @Override
    protected int getBatchSize(String dataStructureName) {
        ReplicatedMapConfig replicatedMapConfig = getReplicatedMapConfig(dataStructureName);
        MergePolicyConfig mergePolicyConfig = replicatedMapConfig.getMergePolicyConfig();
        return mergePolicyConfig.getBatchSize();
    }

    @Override
    protected SplitBrainMergePolicy getMergePolicy(String dataStructureName) {
        ReplicatedMapConfig replicatedMapConfig = getReplicatedMapConfig(dataStructureName);
        return mergePolicyProvider.getMergePolicy(replicatedMapConfig.getMergePolicyConfig().getPolicy(), replicatedMapConfig.getUserCodeNamespace());
    }

    @Override
    protected String getDataStructureName(ReplicatedRecordStore replicatedRecordStore) {
        return replicatedRecordStore.getName();
    }

    @Override
    protected int getPartitionId(ReplicatedRecordStore replicatedRecordStore) {
        return replicatedRecordStore.getPartitionId();
    }

    @Override
    protected OperationFactory createMergeOperationFactory(String dataStructureName, SplitBrainMergePolicy<Object, ReplicatedMapMergeTypes<Object, Object>, Object> mergePolicy, int[] partitions, List<ReplicatedMapMergeTypes<Object, Object>>[] entries) {
        return new MergeOperationFactory(dataStructureName, partitions, entries, mergePolicy);
    }

    private ReplicatedMapConfig getReplicatedMapConfig(String name) {
        return service.getReplicatedMapConfig(name);
    }
}
